Two-band superconductivity in MgB2 -: art. no. 187002

被引：313

作者：

Iavarone, M ^{[1
]}

Karapetrov, G ^{[1
]}

Koshelev, AE ^{[1
]}

Kwok, WK ^{[1
]}

Crabtree, GW ^{[1
]}

Hinks, DG ^{[1
]}

Kang, WN ^{[1
]}

Choi, EM ^{[1
]}

Kim, HJ ^{[1
]}

Kim, HJ ^{[1
]}

Lee, SI ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.89.187002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The study of the anisotropic superconductor MgB2 using a combination of scanning tunneling microscopy and spectroscopy reveals two distinct energy gaps at Delta(1)=2.3 meV and Delta(2)=7.1 meV at 4.2 K. Different spectral weights of the partial superconducting density of states are a reflection of different tunneling directions in this multiband system. Temperature evolution of the tunneling spectra follows the BCS scenario [Phys. Rev. Lett. 3, 552 (1959)] with both gaps vanishing at the bulk T-c. The data confirm the importance of Fermi-surface sheet dependent superconductivity in MgB2 proposed in the multigap modelLiu et al. [Phys. Rev. Lett. 87, 087005 (2001)].

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